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You can think of these 4 things as a hierarchy, where each 'element' is a building block for the next level. The smallest 'unit' are cells. There are trillions of cells in your body and ...

Speciation (the formation of a new species) can be broken down into a few concise steps.

The most important step is the isolation of two populations. This usually occurs because of physic...

Many grana, large surface area for photosynthetic pigments, electron carriers and ATP synthase enzymes. 

Photosynthetic pigments are arranged into structures called photosystems, allows m...